Empire Energy Group Limited, together its subsidiaries, engages in the acquisition, development, production, exploration, and sale of oil and natural gas in the United States. It operates through US Oil and Gas Operations and Northern Territory Gas Operations segments. The company focuses on onshore long-life oil and gas fields in the United States. It sells oil and gas products primarily to owners of domestic pipelines, utilities, and refiners located in Pennsylvania and New York. The company was formerly known as Imperial Corporation Limited and changed its name to Empire Energy Group Limited in March 2011. Empire Energy Group Limited is based in Sydney, Australia.